xsi:type typing supportHoward Katz howardk at fatdog.com
Sat Mar 12 09:00:08 PST 2005
> -----Original Message----- > From: Michael Kay [mailto:http://xquery.com/mailman/listinfo/talk] > Sent: Saturday, March 12, 2005 6:49 AM > To: http://xquery.com/mailman/listinfo/talk; http://xquery.com/mailman/listinfo/talk > Subject: RE: xsi:type typing support > > I think it's quite hard to find a subset that's meaningful. The only > approach I can think of that might be workable is to restrict yourself to > simple types only. > > But I can't imagine why users would want to add > xsi:type="decimal" to every > <price> element in their source document, when it would be much easier to > cast the value of the element to a decimal in their queries. In general I agree. However: 1) There's no need for the user to cast if the data's already typed, 2) In some cases if desirable xsi:type could easily be added programmatically via XQuery or XSLT to existing source, 2) The documents might be machine-generated, with xsi:type info supplied by the source process, 3) In both cases the addition of xsi:type info would provide self-documentation, and 4) might be useful for making programmatic decisions for example as to whether to do sorting or not, as in let $results := <results> <result><number xsi:type="xs:int">02</number></result> <result><number xsi:type="xs:int">1</number></result> </results> return if ( count( $results//number[ @xsi:type="xs:int" ] ) eq count( $results//number ) ) then for $num in $results//number order by xs:integer($num) return $num else for $num in $results//number return $num Howard > Michael Kay > http://www.saxonica.com/ > > > -----Original Message----- > > From: http://xquery.com/mailman/listinfo/talk > > [mailto:http://xquery.com/mailman/listinfo/talk] On Behalf Of Howard Katz > > Sent: 12 March 2005 01:13 > > To: http://xquery.com/mailman/listinfo/talk > > Subject: xsi:type typing support > > > > I'd like to be able to provide some very simple typing > > support with my query > > engine. I don't however want to tackle the whole PSVI thing > > (not having that > > many productive years ahead of me), but would be quite happy > > if I could do a > > "schema lite" version of my engine that just supported > > xsi:type. Is that > > doable without going the whole schema validation route? I > > keep thinking that > > what I need to know is right there in the spec, but every time I start > > digging into it, my eyes start rolling upward in my head and > > vertigo quickly > > ensues. Any pointers? Help my autumn years be productive > > ones, please! :-) > > > > Howard > > > > > > _______________________________________________ > > http://xquery.com/mailman/listinfo/talk > > http://xquery.com/mailman/listinfo/talk > > > > > _______________________________________________ > http://xquery.com/mailman/listinfo/talk > http://xquery.com/mailman/listinfo/talk >
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